New! 8GB 2X 4GB Memory DDR3 PC3-8500 for HP/Compaq ProBook 4520s (DDR3) Could be Samsung, Kingston, Hynix, Smart, Corsair, Elpida, Micron, or Nanya Warranty: LIFETIME WARRANTY WorldWide Shipping to most countries & USA Capacity: 8gb (2x4gb) - You receive 2 Stick of the 4gb SODIMMS for a total of 8gb